[PATCH platform-next 1/9] platform/x86: mlx-platform: Make activation of some drivers conditional

[Vadim Pasternak <vadimp@nvidia.com>]

Current assumption in driver that any system is capable of LED,
hotplug or watchdog support. It could be not true for some new coming
systems.
Add validation for LED, hotplug, watchdog configuration and skip
activation of relevant drivers if not configured.

Signed-off-by: Vadim Pasternak <vadimp@nvidia.com>
Reviewed-by: Oleksandr Shamray <oleksandrs@nvidia.com>
---
 drivers/platform/x86/mlx-platform.c | 62 ++++++++++++++++-------------
 1 file changed, 35 insertions(+), 27 deletions(-)

diff --git a/drivers/platform/x86/mlx-platform.c b/drivers/platform/x86/mlx-platform.c
index 447044fdcb77..54c99f3fde51 100644
--- a/drivers/platform/x86/mlx-platform.c
+++ b/drivers/platform/x86/mlx-platform.c
@@ -4853,16 +4853,18 @@ static int __init mlxplat_init(void)
 	}
 
 	/* Add hotplug driver */
-	mlxplat_hotplug->regmap = priv->regmap;
-	priv->pdev_hotplug = platform_device_register_resndata(
-				&mlxplat_dev->dev, "mlxreg-hotplug",
-				PLATFORM_DEVID_NONE,
-				mlxplat_mlxcpld_resources,
-				ARRAY_SIZE(mlxplat_mlxcpld_resources),
-				mlxplat_hotplug, sizeof(*mlxplat_hotplug));
-	if (IS_ERR(priv->pdev_hotplug)) {
-		err = PTR_ERR(priv->pdev_hotplug);
-		goto fail_platform_mux_register;
+	if (mlxplat_hotplug) {
+		mlxplat_hotplug->regmap = priv->regmap;
+		priv->pdev_hotplug =
+		platform_device_register_resndata(&mlxplat_dev->dev,
+						  "mlxreg-hotplug", PLATFORM_DEVID_NONE,
+						  mlxplat_mlxcpld_resources,
+						  ARRAY_SIZE(mlxplat_mlxcpld_resources),
+						  mlxplat_hotplug, sizeof(*mlxplat_hotplug));
+		if (IS_ERR(priv->pdev_hotplug)) {
+			err = PTR_ERR(priv->pdev_hotplug);
+			goto fail_platform_mux_register;
+		}
 	}
 
 	/* Set default registers. */
@@ -4875,24 +4877,26 @@ static int __init mlxplat_init(void)
 	}
 
 	/* Add LED driver. */
-	mlxplat_led->regmap = priv->regmap;
-	priv->pdev_led = platform_device_register_resndata(
-				&mlxplat_dev->dev, "leds-mlxreg",
-				PLATFORM_DEVID_NONE, NULL, 0,
-				mlxplat_led, sizeof(*mlxplat_led));
-	if (IS_ERR(priv->pdev_led)) {
-		err = PTR_ERR(priv->pdev_led);
-		goto fail_platform_hotplug_register;
+	if (mlxplat_led) {
+		mlxplat_led->regmap = priv->regmap;
+		priv->pdev_led =
+		platform_device_register_resndata(&mlxplat_dev->dev, "leds-mlxreg",
+						  PLATFORM_DEVID_NONE, NULL, 0, mlxplat_led,
+						  sizeof(*mlxplat_led));
+		if (IS_ERR(priv->pdev_led)) {
+			err = PTR_ERR(priv->pdev_led);
+			goto fail_platform_hotplug_register;
+		}
 	}
 
 	/* Add registers io access driver. */
 	if (mlxplat_regs_io) {
 		mlxplat_regs_io->regmap = priv->regmap;
-		priv->pdev_io_regs = platform_device_register_resndata(
-					&mlxplat_dev->dev, "mlxreg-io",
-					PLATFORM_DEVID_NONE, NULL, 0,
-					mlxplat_regs_io,
-					sizeof(*mlxplat_regs_io));
+		priv->pdev_io_regs = platform_device_register_resndata(&mlxplat_dev->dev,
+								       "mlxreg-io",
+								       PLATFORM_DEVID_NONE, NULL,
+								       0, mlxplat_regs_io,
+								       sizeof(*mlxplat_regs_io));
 		if (IS_ERR(priv->pdev_io_regs)) {
 			err = PTR_ERR(priv->pdev_io_regs);
 			goto fail_platform_led_register;
@@ -4949,9 +4953,11 @@ static int __init mlxplat_init(void)
 	if (mlxplat_regs_io)
 		platform_device_unregister(priv->pdev_io_regs);
 fail_platform_led_register:
-	platform_device_unregister(priv->pdev_led);
+	if (mlxplat_led)
+		platform_device_unregister(priv->pdev_led);
 fail_platform_hotplug_register:
-	platform_device_unregister(priv->pdev_hotplug);
+	if (mlxplat_hotplug)
+		platform_device_unregister(priv->pdev_hotplug);
 fail_platform_mux_register:
 	while (--i >= 0)
 		platform_device_unregister(priv->pdev_mux[i]);
@@ -4974,8 +4980,10 @@ static void __exit mlxplat_exit(void)
 		platform_device_unregister(priv->pdev_fan);
 	if (priv->pdev_io_regs)
 		platform_device_unregister(priv->pdev_io_regs);
-	platform_device_unregister(priv->pdev_led);
-	platform_device_unregister(priv->pdev_hotplug);
+	if (priv->pdev_led)
+		platform_device_unregister(priv->pdev_led);
+	if (priv->pdev_hotplug)
+		platform_device_unregister(priv->pdev_hotplug);
 
 	for (i = mlxplat_mux_num - 1; i >= 0 ; i--)
 		platform_device_unregister(priv->pdev_mux[i]);
-- 
2.20.1